#include <iostream>
#include <string>
using namespace std;

#define p(x) cout << x << endl;
#define el cout << endl;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    string n;
    cin >> n;
    
    if(n == "0"){
        cout << "0" << endl;
    }else{
        cout << n << "0" << endl;
    }
}